Allelopathy of Root Exudates and Aqueous Extracts from Soil of Cassava to Rigidoprus lignosu and Corynespora cassiicola of Hevea brasiliensis

doi:10.3969/j.issn.1000-2561.2020.08.027

Abstract

Abstract:

In order to study the allelopathic effect of the root exudates and aqueous extracts from the soil of cassava on the Rigidoporus lignosus and Corynespora cassiicola of rubber tree, the growth of the C. cassiicola and R. lignosus of rubber tree were measured using the mycelial growth rate method. The root exudates of cassava could promote the growth of the C. cassiicola and R. lignosus of Hevea brasiliensis. The effect on C. cassiicola of four concentrations was not obvious at any treatment times, while the effect on R. lignosus was more obvious with the concentration increase. When the concentration was 40 mg/mL, the effect on R. lignosus was significant. The allelopathic effect of the four concentration root exudates on C. cassiicola and R. lignosu was not obvious at any treatment days. The allelopathic effect of the aqueous extracts from the soil on C. cassiicola and R. lignosus showed promotion. With the concentration increased, the promotion effect increased gradually. On the 2nd day after treatment, there was a significant effect on R. lignosus when the concentration was 40 mg/mL, while there was a significant effect when the concentration was 8 mg/mL on the 3rd and 4th day after treatment. There was a significant effect on C. cassiicola when the concentration was 200 mg/mL at any treatment days. When the concentration of the aqueous extracts from the soil was less than 8 mg/mL, the effect on R. lignosuof on the 3rd day was not obvious. When the concentration was more than 40 mg/mL, the allelopathic effect on R. lignosu on the 2nd day after treatment was significantly higher than that on the 3rd day and 4th day after treatment. The effect of the four concentration aqueous extracts from the soil on C. cassiicola was not obvious. Intercropping cassava in the rubber plantation could promote the occurrence of Corynespora leaf falling disease and white root disease of H. brasiliensis to a certain extent.

Key words: cassava, root exudates, aqueous extracts from soil, Rigidoporus lignosus (Klotzsch) Imaz. of Hevea brasiliensis, Corynespora cassiicola of Hevea brasiliensis, allelopathic effect

CLC Number:

S435.33

YUAN Fei,LIU Zifan,YAN Wenjing,LIU Peipei. Allelopathy of Root Exudates and Aqueous Extracts from Soil of Cassava to Rigidoprus lignosu and Corynespora cassiicola of Hevea brasiliensis[J]. Chinese Journal of Tropical Crops, 2020, 41(8): 1708-1713.

Figures/Tables 5

References 23

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来源 Resource	有机质 Organic matter /(g·kg^-1)	碱解氮 Alkaline nitrogen /(mg·kg^-1)	速效磷 Available phosphorus /(mg·kg^-1)	速效钾 Available potassium /(mg·kg^-1)	pH
间作土壤	8.16	22.75	25.15	42.87	4.75
单作土壤	6.20	19.83	82.75	58.11	4.52

来源 Resource	有机质 Organic matter /(g·kg^-1)	碱解氮 Alkaline nitrogen /(mg·kg^-1)	速效磷 Available phosphorus /(mg·kg^-1)	速效钾 Available potassium /(mg·kg^-1)	pH
间作土壤	8.16	22.75	25.15	42.87	4.75
单作土壤	6.20	19.83	82.75	58.11	4.52

浓度 Concentration /(mg·mL^-1)	处理后2 d 2^nd day after treatment	处理后3 d 3^rdday after treatment	处理后4 d 4^th day after treatment	处理后5 d 5^th day after treatment	处理后6 d 6^th day after treatment
0（CK）	0.00±0.63^aA	0.00±0.40^aA	0.00±0.67^aA	0.00±1.77^aA	0.00±0.30^aA
8	2.44±2.11^aA	1.15±2.70^aA	1.66±1.59^aA	2.75±1.56^aA	0.24±0.52^aA
40	3.09±2.89^aA	4.70±3.18^aA	5.66±1.85^aA	3.69±2.42^aA	0.99±0.55^aA
200	2.98±1.67^aA	5.74±2.01^aA	2.77±1.43^aA	4.34±1.27^aA	2.47±0.41^aA
1000	1.46±1.49^aA	3.39±2.28^aA	2.85±1.54^aA	3.69±1.65^aA	0.47±0.54^aA

浓度 Concentration /(mg·mL^-1)	处理后2 d 2^nd day after treatment	处理后3 d 3^rdday after treatment	处理后4 d 4^th day after treatment	处理后5 d 5^th day after treatment	处理后6 d 6^th day after treatment
0（CK）	0.00±0.63^aA	0.00±0.40^aA	0.00±0.67^aA	0.00±1.77^aA	0.00±0.30^aA
8	2.44±2.11^aA	1.15±2.70^aA	1.66±1.59^aA	2.75±1.56^aA	0.24±0.52^aA
40	3.09±2.89^aA	4.70±3.18^aA	5.66±1.85^aA	3.69±2.42^aA	0.99±0.55^aA
200	2.98±1.67^aA	5.74±2.01^aA	2.77±1.43^aA	4.34±1.27^aA	2.47±0.41^aA
1000	1.46±1.49^aA	3.39±2.28^aA	2.85±1.54^aA	3.69±1.65^aA	0.47±0.54^aA

浓度 Concentration /(mg·mL^-1)	处理后2 d 2^nd day after treatment	处理后3 d 3^rdday after treatment	处理后4 d 4^th day after treatment	处理后5 d 5^th day after treatment	处理后6 d 6^th day after treatment
0（CK）	0.00±2.11^cA	0.00±1.88^cA	0.00±3.00^dA	0.00±2.64^bA	0.00±2.47^bA
8	7.25±7.56^cA	6.90±6.80^cA	8.06±6.94^dA	8.52±7.89^bA	4.90±8.69^bA
40	15.46±8.08^abA	16.17±9.17^abA	20.85±8.21^bcA	23.97±10.90^aA	25.00±12.79^aA
200	21.46±4.56^bA	23.11±5.11^aA	24.28±3.57^abA	27.69±4.89^aA	29.55±6.85^aA
1000	31.93±6.70^aA	25.31±5.30^aA	29.00±6.89^aA	30.35±6.34^aA	31.11±9.52^aA